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P2027A Datasheet

General Purpose EMI Reduction IC

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P2027A
General Purpose EMI
Reduction IC
Description
The P2027 is a versatile spread spectrum frequency modulator
designed specifically for digital camera and other digital video and
imaging applications. The P2027 reduces electromagnetic interference
(EMI) at the clock source, which provides system wide reduction of
EMI of all clock dependent signals. The P2027 allows significant
system cost savings by reducing the number of circuit board layers and
shielding that are traditionally required to pass EMI regulations.
The P2027 uses the most efficient and optimized modulation profile
approved by the FCC and is implemented in a proprietary alldigital
method.
The P2027 modulates the output of a single PLL in order to “spread”
the bandwidth of a synthesized clock and, more importantly, decreases
the peak amplitudes of its harmonics. This results in significantly
lower system EMI compared to the typical narrow band signal
produced by oscillators and most frequency generators. Lowering
EMI by increasing a signal’s bandwidth is called ‘spread spectrum
clock generation.’
Applications
The P2027 is targeted towards DSC market as well as other imaging
and digital video applications like DVD and VCD players.
Features
FCC Approved Method of EMI Attenuation
Provides up to 20 dB of EMI Suppression
Generates a Low EMI Spread Spectrum Clock of the Input
Frequency
Optimized for 27 MHz Operation
Internal Loop Filter Minimizes External Components and Board
Space
3 Selectable Spread Ranges and 2 Modulation Rate Options
SSON Control Pin for Spread Spectrum Enable and Disable Options
Low CycletoCycle Jitter
3.3 V Operating Voltage
16 mA Output Drives
TTL or CMOS Compatible Outputs
Low Power CMOS Design
Supports Digital Camera and Other Digital Video and Imaging
Applications
Available in 8pin SOIC and TSSOP Packages
These are PbFree Devices
http://onsemi.com
SOIC8
S SUFFIX
CASE 751BD
TSSOP8
T SUFFIX
CASE 948AL
PIN CONFIGURATION
1
XIN / CLKIN
VDD
XOUT
SR0
MRA
ModOUT
VSS
SSON
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
August, 2011 Rev. 2
1
Publication Order Number:
P2027A/D


  ON Semiconductor Electronic Components Datasheet  

P2027A Datasheet

General Purpose EMI Reduction IC

No Preview Available !

XIN
XOUT
Crystal
Oscillator
P2027A
MRA SR0 SSON
VDD
Frequency
Divider
Feedback
Divider
Modulation
PLL
Phase
Detector
Loop Filter
VCO
Output
Divider
ModOUT
Table 1. PIN DESCRIPTION
Pin#
Pin Name
Type
1 XIN / CLKIN
I
2 XOUT
O
3 MRA
I
4 VSS
5 SSON
P
I
6 ModOUT
7 SR0
O
I
8 VDD
P
Figure 1. Block Diagram
VSS
Description
Crystal connection or external reference frequency input. This pin has dual functions. It can
be connected to either an external crystal or an external reference clock.
Crystal connection. Input connection for an external crystal. If using an external reference,
this pin must be left unconnected.
Digital logic input used to select Modulation Rate (see Table 2). This pin has an internal
pullup resistor.
Ground Connection. Connect to system ground.
Digital logic input used to enable Spread Spectrum function (Active Low). Spread Spectrum
function enable when low. This pin has an internal pulllow resistor.
Spread Spectrum Clock Output.
Digital logic input used to select Spreading Range (see Table 2). This pin has an internal
pullup resistor.
Connect to +3.3 V Power Supply.
Table 2. MODULATION AND SPREADING SELECTION
MRA
SR0
Spread Range
00
Reserve
01
±0.30%
10
±0.20%
11
±0.60%
Modulation Rate
Reserve
(Fin/10)*34.72 KHz
(Fin/10)*20.83 KHz
(Fin/10)*20.83 KHz
http://onsemi.com
2


Part Number P2027A
Description General Purpose EMI Reduction IC
Maker ON Semiconductor
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